Crop Circles. They appear all over the world. There are reports that they were seen in Japan, Russia, America, Canada, New Zealand, Australia, Bulgaria, France, Spain, Germany, Israel. There were several theories as to what is the source of this phenomenon. For example, winds or magnetic fields that cannot be measured. In the 1990s, two men confessed that they had created circles, since they had nothing to do. But some of them are so great that it seems that even a whole group of loafers cannot do this in one night without dust and noise.